TM 9-4940-342-14&P
Section Ill. TROUBLESHOOTING
4-5.
General
a. This
section
contains
troubleshooting
information for locating and correcting most of
the troubles which may develop in the steam
cleaner. Each malfunction for an individual
component, unit or system is followed by a list of
probable causes and corrective actions. Maintenance
personnel should check out the probable causes
for a malfunction and perform the corrective actions
in the order listed.
b. This manual cannot list all malfunctions that
may occur, nor all probable causes or corrective
actions. If a malfunction is not listed or is not
corrected
by
listed
corrective
actions,
the
maintenance supervisor shall be notified or refer to
the next higher maintenance level.
Table 4-2. Troubleshooting
Malfunction
Probable Causes
Corrective Action
1. Fuel lines broken, clogged or
otherwise obstructed.
Inspect fuel lines.
Repair problem or replace damaged
line.
2. Burner cuts off too soon.
Restriction in fuel inlet lines, fuel filter
or burner nozzles.
Inspect fuel lines, clean filter or
nozzles.
3. Excessive smoke in burner exhaust.
Dirty burner nozzles and for fuel filter.
Insufficient air.
Clean fuel filter, remove and clean fuel
nozzles. Adjust air gate.
4. Improper fuel being used.
Check for proper fuel.
Change fuel if required.
5. Improper venting.
Check venting requirement.
Repair or replace as necessary.
Section IV. MAINTENANCE AND ADJUSTMENT OF STEAM CLEANER
4-6.
General
a. This
section
contains
maintenance
and
adjustment
information
covering
the
various
components and/or systems on the steam cleaner.
Maintenance to be performed covers these areas
related to the normal maintenance and/or repair
required after operation when the unit is being
prepared for major repairs. Maintenance personnel
should determine the related malfunction and
perform the corrective actions as indicated.
b. This section cannot list all maintenance or
adjustments required due to the various operational
modes and surrounding conditions of the unit.
Should maintenance arise which is not covered in
this section notify maintenance supervisor or higher
maintenance.
4-7.
Draining or Cleaning Water Supply Tank
(Refer to Fig C-6)
To drain or clean the water supply tank, shut off
water supply to cleaner and unscrew overflow tube.
If cleaning is required flush tank with clear water
removing any accumulated deposits on bottom of
tank. Replace overflow pipe, turn on water supply
and inspect for leaks at overflow, nipple threads.
4-8.
Water Pump Belt Tension (Refer to Fig C-7)
Tension on water pump belt should be only tight
enough to prevent slippage during unit operation.
NOTE
If water pump to motor belt requires adjustment,
refer to next higher level of maintenance.
4-9.
Coil Back Pressure Test (Refer to Fig 2-1)
a. Periodic checks must be taken to ascertain
scale buildup in heater coil and plumbing
assemblies.
b. To determine amount of restriction proceed as
follows:
(1) Stop the cleaner as described in Operating
Procedures, Section II.
(2) Remove cleaning gun nozzles.
(3) Open discharge valves (32), place selector
valve (8) in closed (vertical) position.
(4) Turn pump control switch (4) to ON and
with water flowing, observe pressure differential
between back pressure gage (6) and steam pressure
gage (11).
(5) If pressure differential is over 100 psi and
blowdown procedure does not reduce pressure
differential to normal, the cleaner should be
descaled.
4-10. Loose or Leaky Connections
Any leaks which may develop in the system
should be tightened, repaired or replaced when
the unit is in the OFF position. Select a wrench of
proper size and type, and tighten fitting in a
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